jquery lazy, downloading twice the images

Question

i use this plugin for jquery layz http://jquery.eisbehr.de/lazy/

but browser downloading twice the images;

i see this browser downloading twice the images when lazy loading with js

but this cant help me

my code:

jQuery('.image img').Lazy({
        afterLoad: function (element) {
            element[0].style.opacity = 1;
            element.parent().addClass('loaded-image');
            element.parent().removeClass('image');
        },
        // your configuration goes here
        scrollDirection: 'vertical',
        effect: 'fadeIn',
        visibleOnly: true,
        onError: function (element) {
            console.log('error loading ' + element.data('src'));
        }
    });

image problem